/**
 * 扩展$.ajax,封装统一返回处理
 * Created by gameloft9 on 2017/12/6.
 */
layui.define(['jquery'],function(exports){
    //拿到模块变量
     var $ = layui.jquery;
    (function($, window){
        // i'll just put them here to get evaluated on script load
        var htmlSpecialCharsRegEx = /[<>&\r\n"']/gm;
        var htmlSpecialCharsPlaceHolders = {
            '<': 'lt;',
            '>': 'gt;',
            '&': 'amp;',
            '\r': "#13;",
            '\n': "#10;",
            '"': 'quot;',
            "'": '#39;' /*single quotes just to be safe, IE8 doesn't support &apos;, so use &#39; instead */
        };

        $.extend({
            //
            //$.fileDownload('/path/to/url/', options)
            //  see directly below for possible 'options'
            fileDownload: function (fileUrl, options) {

                //provide some reasonable defaults to any unspecified options below
                var settings = $.extend({

                    //
                    //Requires jQuery UI: provide a message to display to the user when the file download is being prepared before the browser's dialog appears
                    //
                    preparingMessageHtml: null,

                    //
                    //Requires jQuery UI: provide a message to display to the user when a file download fails
                    //
                    failMessageHtml: null,

                    //
                    //the stock android browser straight up doesn't support file downloads initiated by a non GET: http://code.google.com/p/android/issues/detail?id=1780
                    //specify a message here to display if a user tries with an android browser
                    //if jQuery UI is installed this will be a dialog, otherwise it will be an alert
                    //Set to null to disable the message and attempt to download anyway
                    //
                    androidPostUnsupportedMessageHtml: "Unfortunately your Android browser doesn't support this type of file download. Please try again with a different browser.",

                    //
                    //Requires jQuery UI: options to pass into jQuery UI Dialog
                    //
                    dialogOptions: { modal: true },

                    //
                    //a function to call while the dowload is being prepared before the browser's dialog appears
                    //Args:
                    //  url - the original url attempted
                    //
                    prepareCallback: function (url) { },

                    //
                    //a function to call after a file download successfully completed
                    //Args:
                    //  url - the original url attempted
                    //
                    successCallback: function (url) { },

                    //
                    //a function to call after a file download request was canceled
                    //Args:
                    //  url - the original url attempted
                    //
                    abortCallback: function (url) { },

                    //
                    //a function to call after a file download failed
                    //Args:
                    //  responseHtml    - the html that came back in response to the file download. this won't necessarily come back depending on the browser.
                    //                      in less than IE9 a cross domain error occurs because 500+ errors cause a cross domain issue due to IE subbing out the
                    //                      server's error message with a "helpful" IE built in message
                    //  url             - the original url attempted
                    //  error           - original error cautch from exception
                    //
                    failCallback: function (responseHtml, url, error) { },

                    //
                    // the HTTP method to use. Defaults to "GET".
                    //
                    httpMethod: "GET",

                    //
                    // if specified will perform a "httpMethod" request to the specified 'fileUrl' using the specified data.
                    // data must be an object (which will be $.param serialized) or already a key=value param string
                    //
                    data: null,

                    //
                    //a period in milliseconds to poll to determine if a successful file download has occured or not
                    //
                    checkInterval: 100,

                    //
                    //the cookie name to indicate if a file download has occured
                    //
                    cookieName: "fileDownload",

                    //
                    //the cookie value for the above name to indicate that a file download has occured
                    //
                    cookieValue: "true",

                    //
                    //the cookie path for above name value pair
                    //
                    cookiePath: "/",

                    //
                    //if specified it will be used when attempting to clear the above name value pair
                    //useful for when downloads are being served on a subdomain (e.g. downloads.example.com)
                    //
                    cookieDomain: null,

                    //
                    //the title for the popup second window as a download is processing in the case of a mobile browser
                    //
                    popupWindowTitle: "Initiating file download...",

                    //
                    //Functionality to encode HTML entities for a POST, need this if data is an object with properties whose values contains strings with quotation marks.
                    //HTML entity encoding is done by replacing all &,<,>,',",\r,\n characters.
                    //Note that some browsers will POST the string htmlentity-encoded whilst others will decode it before POSTing.
                    //It is recommended that on the server, htmlentity decoding is done irrespective.
                    //
                    encodeHTMLEntities: true

                }, options);

                var deferred = new $.Deferred();

                //Setup mobile browser detection: Partial credit: http://detectmobilebrowser.com/
                var userAgent = (navigator.userAgent || navigator.vendor || window.opera).toLowerCase();

                var isIos;                  //has full support of features in iOS 4.0+, uses a new window to accomplish this.
                var isAndroid;              //has full support of GET features in 4.0+ by using a new window. Non-GET is completely unsupported by the browser. See above for specifying a message.
                var isOtherMobileBrowser;   //there is no way to reliably guess here so all other mobile devices will GET and POST to the current window.

                if (/ip(ad|hone|od)/.test(userAgent)) {

                    isIos = true;

                } else if (userAgent.indexOf('android') !== -1) {

                    isAndroid = true;

                } else {

                    isOtherMobileBrowser = /avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|playbook|silk|iemobile|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(userAgent) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|e\-|e\/|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(di|rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|xda(\-|2|g)|yas\-|your|zeto|zte\-/i.test(userAgent.substr(0, 4));

                }

                var httpMethodUpper = settings.httpMethod.toUpperCase();

                if (isAndroid && httpMethodUpper !== "GET" && settings.androidPostUnsupportedMessageHtml) {
                    //the stock android browser straight up doesn't support file downloads initiated by non GET requests: http://code.google.com/p/android/issues/detail?id=1780

                    if ($().dialog) {
                        $("<div>").html(settings.androidPostUnsupportedMessageHtml).dialog(settings.dialogOptions);
                    } else {
                        alert(settings.androidPostUnsupportedMessageHtml);
                    }

                    return deferred.reject();
                }

                var $preparingDialog = null;

                var internalCallbacks = {

                    onPrepare: function (url) {

                        //wire up a jquery dialog to display the preparing message if specified
                        if (settings.preparingMessageHtml) {

                            $preparingDialog = $("<div>").html(settings.preparingMessageHtml).dialog(settings.dialogOptions);

                        } else if (settings.prepareCallback) {

                            settings.prepareCallback(url);

                        }

                    },

                    onSuccess: function (url) {

                        //remove the perparing message if it was specified
                        if ($preparingDialog) {
                            $preparingDialog.dialog('close');
                        }

                        settings.successCallback(url);

                        deferred.resolve(url);
                    },

                    onAbort: function (url) {

                        //remove the perparing message if it was specified
                        if ($preparingDialog) {
                            $preparingDialog.dialog('close');
                        };

                        settings.abortCallback(url);

                        deferred.reject(url);
                    },

                    onFail: function (responseHtml, url, error) {

                        //remove the perparing message if it was specified
                        if ($preparingDialog) {
                            $preparingDialog.dialog('close');
                        }

                        //wire up a jquery dialog to display the fail message if specified
                        if (settings.failMessageHtml) {
                            $("<div>").html(settings.failMessageHtml).dialog(settings.dialogOptions);
                        }

                        settings.failCallback(responseHtml, url, error);

                        deferred.reject(responseHtml, url);
                    }
                };

                internalCallbacks.onPrepare(fileUrl);

                //make settings.data a param string if it exists and isn't already
                if (settings.data !== null && typeof settings.data !== "string") {
                    settings.data = $.param(settings.data);
                }


                var $iframe,
                    downloadWindow,
                    formDoc,
                    $form;

                if (httpMethodUpper === "GET") {

                    if (settings.data !== null) {
                        //need to merge any fileUrl params with the data object

                        var qsStart = fileUrl.indexOf('?');

                        if (qsStart !== -1) {
                            //we have a querystring in the url

                            if (fileUrl.substring(fileUrl.length - 1) !== "&") {
                                fileUrl = fileUrl + "&";
                            }
                        } else {

                            fileUrl = fileUrl + "?";
                        }

                        fileUrl = fileUrl + settings.data;
                    }

                    if (isIos || isAndroid) {

                        downloadWindow = window.open(fileUrl);
                        downloadWindow.document.title = settings.popupWindowTitle;
                        window.focus();

                    } else if (isOtherMobileBrowser) {

                        window.location(fileUrl);

                    } else {

                        //create a temporary iframe that is used to request the fileUrl as a GET request
                        $iframe = $("<iframe>")
                            .hide()
                            .prop("src", fileUrl)
                            .appendTo("body");
                    }

                } else {

                    var formInnerHtml = "";

                    if (settings.data !== null) {

                        $.each(settings.data.replace(/\+/g, ' ').split("&"), function () {

                            var kvp = this.split("=");

                            //Issue: When value contains sign '=' then the kvp array does have more than 2 items. We have to join value back
                            var k = kvp[0];
                            kvp.shift();
                            var v = kvp.join("=");
                            kvp = [k, v];

                            var key = settings.encodeHTMLEntities ? htmlSpecialCharsEntityEncode(decodeURIComponent(kvp[0])) : decodeURIComponent(kvp[0]);
                            if (key) {
                                var value = settings.encodeHTMLEntities ? htmlSpecialCharsEntityEncode(decodeURIComponent(kvp[1])) : decodeURIComponent(kvp[1]);
                                formInnerHtml += '<input type="hidden" name="' + key + '" value="' + value + '" />';
                            }
                        });
                    }

                    if (isOtherMobileBrowser) {

                        $form = $("<form>").appendTo("body");
                        $form.hide()
                            .prop('method', settings.httpMethod)
                            .prop('action', fileUrl)
                            .html(formInnerHtml);

                    } else {

                        if (isIos) {

                            downloadWindow = window.open("about:blank");
                            downloadWindow.document.title = settings.popupWindowTitle;
                            formDoc = downloadWindow.document;
                            window.focus();

                        } else {

                            $iframe = $("<iframe style='display: none' src='about:blank'></iframe>").appendTo("body");
                            formDoc = getiframeDocument($iframe);
                        }

                        formDoc.write("<html><head></head><body><form method='" + settings.httpMethod + "' action='" + fileUrl + "'>" + formInnerHtml + "</form>" + settings.popupWindowTitle + "</body></html>");
                        $form = $(formDoc).find('form');
                    }

                    $form.submit();
                }


                //check if the file download has completed every checkInterval ms
                setTimeout(checkFileDownloadComplete, settings.checkInterval);


                function checkFileDownloadComplete() {
                    //has the cookie been written due to a file download occuring?

                    var cookieValue = settings.cookieValue;
                    if(typeof cookieValue == 'string') {
                        cookieValue = cookieValue.toLowerCase();
                    }

                    var lowerCaseCookie = settings.cookieName.toLowerCase() + "=" + cookieValue;

                    if (document.cookie.toLowerCase().indexOf(lowerCaseCookie) > -1) {

                        //execute specified callback
                        internalCallbacks.onSuccess(fileUrl);

                        //remove cookie
                        var cookieData = settings.cookieName + "=; path=" + settings.cookiePath + "; expires=" + new Date(0).toUTCString() + ";";
                        if (settings.cookieDomain) cookieData += " domain=" + settings.cookieDomain + ";";
                        document.cookie = cookieData;

                        //remove iframe
                        cleanUp(false);

                        return;
                    }

                    //has an error occured?
                    //if neither containers exist below then the file download is occuring on the current window
                    if (downloadWindow || $iframe) {

                        //has an error occured?
                        try {

                            var formDoc = downloadWindow ? downloadWindow.document : getiframeDocument($iframe);

                            if (formDoc && formDoc.body !== null && formDoc.body.innerHTML.length) {

                                var isFailure = true;

                                if ($form && $form.length) {
                                    var $contents = $(formDoc.body).contents().first();

                                    try {
                                        if ($contents.length && $contents[0] === $form[0]) {
                                            isFailure = false;
                                        }
                                    } catch (e) {
                                        if (e && e.number == -2146828218) {
                                            // IE 8-10 throw a permission denied after the form reloads on the "$contents[0] === $form[0]" comparison
                                            isFailure = true;
                                        } else {
                                            throw e;
                                        }
                                    }
                                }

                                if (isFailure) {
                                    // IE 8-10 don't always have the full content available right away, they need a litle bit to finish
                                    setTimeout(function () {
                                        internalCallbacks.onFail(formDoc.body.innerHTML, fileUrl);
                                        cleanUp(true);
                                    }, 100);

                                    return;
                                }
                            }
                        }
                        catch (err) {

                            //500 error less than IE9
                            internalCallbacks.onFail('', fileUrl, err);

                            cleanUp(true);

                            return;
                        }
                    }


                    //keep checking...
                    setTimeout(checkFileDownloadComplete, settings.checkInterval);
                }

                //gets an iframes document in a cross browser compatible manner
                function getiframeDocument($iframe) {
                    var iframeDoc = $iframe[0].contentWindow || $iframe[0].contentDocument;
                    if (iframeDoc.document) {
                        iframeDoc = iframeDoc.document;
                    }
                    return iframeDoc;
                }

                function cleanUp(isFailure) {

                    setTimeout(function() {

                        if (downloadWindow) {

                            if (isAndroid) {
                                downloadWindow.close();
                            }

                            if (isIos) {
                                if (downloadWindow.focus) {
                                    downloadWindow.focus(); //ios safari bug doesn't allow a window to be closed unless it is focused
                                    if (isFailure) {
                                        downloadWindow.close();
                                    }
                                }
                            }
                        }

                        //iframe cleanup appears to randomly cause the download to fail
                        //not doing it seems better than failure...
                        //if ($iframe) {
                        //    $iframe.remove();
                        //}

                    }, 0);
                }


                function htmlSpecialCharsEntityEncode(str) {
                    return str.replace(htmlSpecialCharsRegEx, function(match) {
                        return '&' + htmlSpecialCharsPlaceHolders[match];
                    });
                }
                var promise = deferred.promise();
                promise.abort = function() {
                    cleanUp();
                    $iframe.attr('src', '').html('');
                    internalCallbacks.onAbort(fileUrl);
                };
                return promise;
            }
        });

    })($, this || window);

    //输出扩展模块(这里只是扩展ajax，并不需要真正输出模块)
    exports('$filedownload',{});
});






























